KOTLIN: If else expression - Revision history

Onnowpurbo: /* Kotlin Nested if Expression */

2022-07-24T03:01:26Z

Kotlin Nested if Expression

Onnowpurbo: /* Kotlin if...else...if Ladder */

2022-07-24T02:58:16Z

Kotlin if...else...if Ladder

Onnowpurbo: /* Kotlin if...else Expression */

2022-07-24T02:54:28Z

Kotlin if...else Expression

Onnowpurbo at 02:49, 24 July 2022

2022-07-24T02:49:32Z

Onnowpurbo at 02:47, 22 July 2022

2022-07-22T02:47:26Z

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Onnowpurbo: Created page with "Sumber: https://www.tutorialspoint.com/kotlin/kotlin_if_else_expression.htm Kotlin if...else expressions works like an if...else expression in any other Modern Computer Progr..."

2022-07-18T01:04:39Z

Created page with "Sumber: https://www.tutorialspoint.com/kotlin/kotlin_if_else_expression.htm Kotlin if...else expressions works like an if...else expression in any other Modern Computer Progr..."

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Sumber: https://www.tutorialspoint.com/kotlin/kotlin_if_else_expression.htm

Kotlin if...else expressions works like an if...else expression in any other Modern Computer Programming. So let's start with our traditional if...else statement available in Kotlin.

Syntax
The syntax of a traditional if...else expression is as follows:

if (condition) {
// code block A to be executed if condition is true
} else {
// code block B to be executed if condition is false
}
Here if statement is executed and the given condition is checked. If this condition is evaluated to true then code block A is executed, otherwise program goes into else part and code block B is executed.

Example
You can try the following example:

fun main(args: Array<String>) {
val age:Int = 10

if (age > 18) {
print("Adult")
} else {
print("Minor")
}
}
When you run the above Kotlin program, it will generate the following output:

Minor
Kotlin if...else Expression
Kotlin if...else can also be used as an expression which returns a value and this value can be assigned to a variable. Below is a simple syntax of Kotlin if...else expression:

Syntax
val result = if (condition) {
// code block A to be executed if condition is true
} else {
// code block B to be executed if condition is false
}
If you're using if as an expression, for example, for returning its value or assigning it to a variable, the else branch is mandatory.

Examples
fun main(args: Array<String>) {
val age:Int = 10

val result = if (age > 18) {
"Adult"
} else {
"Minor"
}
println(result)
}
When you run the above Kotlin program, it will generate the following output:

Minor
You can ommit the curly braces {} when if has only one statement:

fun main(args: Array<String>) {
val age:Int = 10

val result = if (age > 18) "Adult" else "Minor"
println(result)
}
When you run the above Kotlin program, it will generate the following output:

Minor
You can include multiple statements in if...else block, in this case the last expression is returned as the value of the block. Try the following example:

fun main(args: Array<String>) {
val age:Int = 10

val result = if (age > 18) {
println("Given condition is true")
"Adult"
} else {
println("Given condition is false")
"Minor"
}
print("The value of result : ")
println(result)
}
When you run the above Kotlin program, it will generate the following output:

Given condition is false
The value of result : Minor
Kotlin if...else...if Ladder
You can use else if condition to specify a new condition if the first condition is false.

Syntax
if (condition1) {
// code block A to be executed if condition1 is true
} else if (condition2) {
// code block B to be executed if condition2 is true
} else {
// code block C to be executed if condition1 and condition2 are false
}
Example
fun main(args: Array<String>) {
val age:Int = 13

val result = if (age > 19) {
"Adult"
} else if ( age > 12 && age < 20 ){
"Teen"
} else {
"Minor"
}
print("The value of result : ")
println(result)
}
When you run the above Kotlin program, it will generate the following output:

The value of result : Teen
Kotlin Nested if Expression
Kotlin allows to put an if expression inside another if expression. This is called nested if expression

Syntax
if(condition1) {
// code block A to be executed if condition1 is true
if( (condition2) {
// code block B to be executed if condition2 is true
}else{
// code block C to be executed if condition2 is fals
}
} else {
// code block D to be executed if condition1 is false
}
Example
fun main(args: Array<String>) {
val age:Int = 20

val result = if (age > 12) {
if ( age > 12 && age < 20 ){
"Teen"
}else{
"Adult"
}
} else {
"Minor"
}
print("The value of result : ")
println(result)
}
When you run the above Kotlin program, it will generate the following output:

The value of result : Adult
Quiz Time (Interview & Exams Preparation)
Q 1 - Which of the following is true about Kotlin if expression?

A - Kotlin support traditional if...else expression.

B - Kotlin if...else expression can be nested.

C - Kotlin if...else expression returns a value which can be assigned to a variable.

D - All of the above

Q 2 - Which of the following is not supported by Kotlin?

A - if...else if...else

B - if...then...else

C - if...else...

D - None of the above

Q 3 - What will be the output of the following code?

fun main(args: Array<String>) {

var x = 20
var y = 15
var z = "Mango"

val result = if (x > y ) {
z = "Orange"
} else {
z = "Apple"
}
println("Value of result = $z")
}
A - Mango

B - Orange

C - Apple

D - None of the above

==Referensi==

* https://www.tutorialspoint.com/kotlin/kotlin_if_else_expression.htm

@@ Line 168: / Line 168: @@
 Kotlin allows to put an if expression inside another if expression. This is called nested if expression
 ===Syntax===
@@ Line 201: / Line 204: @@
 When you run the above Kotlin program, it will generate the following output:
   The value of result : Adult

@@ Line 131: / Line 131: @@
 You can use else if condition to specify a new condition if the first condition is false.
   Syntax
@@ Line 158: / Line 160: @@
 When you run the above Kotlin program, it will generate the following output:
   The value of result : Teen

@@ Line 50: / Line 50: @@
 Kotlin if...else can also be used as an expression which returns a value and this value can be assigned to a variable. Below is a simple syntax of Kotlin if...else expression:
 ===Syntax===
@@ Line 60: / Line 62: @@
 If you're using if as an expression, for example, for returning its value or assigning it to a variable, the else branch is mandatory.
 ===Examples===
@@ Line 75: / Line 79: @@
 When you run the above Kotlin program, it will generate the following output:
   Minor
 You can ommit the curly braces {} when if has only one statement:
   fun main(args: Array<String>) {
@@ Line 88: / Line 97: @@
 When you run the above Kotlin program, it will generate the following output:
   Minor
 You can include multiple statements in if...else block, in this case the last expression is returned as the value of the block. Try the following example:
   fun main(args: Array<String>) {
@@ Line 108: / Line 121: @@
 When you run the above Kotlin program, it will generate the following output:
   Given condition is false

@@ Line 2: / Line 2: @@
 Kotlin if...else expressions works like an if...else expression in any other Modern Computer Programming. So let's start with our traditional if...else statement available in Kotlin.
 ==Syntax==
 The syntax of a traditional if...else expression is as follows:
   if (condition) {
@@ Line 14: / Line 19: @@
 Here if statement is executed and the given condition is checked. If this condition is evaluated to true then code block A is executed, otherwise program goes into else part and code block B is executed.
 ==Example==
 You can try the following example:
   fun main(args: Array<String>) {
@@ Line 30: / Line 41: @@
 When you run the above Kotlin program, it will generate the following output:
   Minor